Grigor Dimitrov of Bulgaria hits a return during the first round match against Ugo Humbert of France at the Rolex Paris Masters 1000 held at the AccorHotels Arena in Paris, France Oct. 29, 2019. (Photo by Aurelien Morissard/Xinhua)

Grigor Dimitrov of Bulgaria hits a return during the first round match against Ugo Humbert of France at the Rolex Paris Masters 1000 held at the AccorHotels Arena in Paris, France Oct. 29, 2019. (Photo by Aurelien Morissard/Xinhua)

Ugo Humbert of France hits a return during the first round match against Grigor Dimitrov of Bulgaria at the Rolex Paris Masters 1000 held at the AccorHotels Arena in Paris, France Oct. 29, 2019. (Photo by Aurelien Morissard/Xinhua)

Ugo Humbert of France hits a return during the first round match against Grigor Dimitrov of Bulgaria at the Rolex Paris Masters 1000 held at the AccorHotels Arena in Paris, France Oct. 29, 2019. (Photo by Aurelien Morissard/Xinhua)

Ugo Humbert of France serves during the first round match against Grigor Dimitrov of Bulgaria at the Rolex Paris Masters 1000 held at the AccorHotels Arena in Paris, France Oct. 29, 2019. (Photo by Aurelien Morissard/Xinhua)